Tool-feed device for crank-pin-turning lathes



Feb. 24, 1931. 1,793,789

TooL EEED DEVICE Fon CRANE PIN TURNING LATHEs VF. S. FLOETER Filed Oct. 17, 1929 2 Sheets-Sheet l l MMNNQRLQ I F. s. FLOETER 1,793,789

TOOL FEED DEVICE FOR CRANK PIN TURNING LATHES Feb. 24, 1931.

2 Sheets-Sheet 2 Filed Oct. 17. 1929 l .INVENTOR Frede wl 5.] 7l0eer ATTORNEY Patented Feb. 24, 1931 UNITE-D STATES wenn PATENT OFFICE FREDERICK s/FLCETER, on SAGINAW, MICHIGAN, AssIGNoR To WICKEs Bnos., or i sAGINAw, MICHIGAN, A Conroanricivor MICHIGAN Application filed October 17, 1929. Serial No. '$00,260.

This invention relates to machines for turn-` ing. the bearing surfaces oi' one or more crank pins formed integral with a shaft and pertains more particularly to the type or' lathe in vs which the shaft isrotated onits axis, the cutting tools following the Crank pin in its revolution. lMachines of the kind towhich my invention is adapted to be applied comprise essentially two shaft-s that are `parallel with 1o the axis of the crankshaft to be machined and carry eccentrics` on which are'mounted one or more tool-carrying frames upon which are the `tool-holders. The eccentrics impart to each frame a movement like that of the Vside I rod connecting the drive Wheels of a locomotive, which movemei'it I shall designateiior purposes of description as orbital.

My invention 1s adapted to be`` applied to a machine of the typeillustrated in Patent No.

1,011,849, issued December 12, 1911, to Riddell. i

`The invention as claimed-herein is embodied in a mechanism involving a new modeof operationfor feeding the tools into and away f 2 5 from 'the work.

` The improvement provides a mechanism, actuated either from the mainmotor drive of the machine or by` an independent auxiliary motor, whereby the feed otthe' toolsinto the 130 Work during the orbital movement otthetool! carrying `frames can beV accomplished accurately andpositively. y My invention also includes a novelarrangement ofparts operatively connectingthe `sevn3 eral tool-holders with a `'single power source so all tools are fed into the'ivork six'n'ultaneous ly and With exactly the same amount of `feed, regardless of the' fact that the tools themselves `are'('hescribing orbits or circles of revolution. Slippage `is avoided, assuring L uniform linished diameters Afor. the several crank -pins i l With the foregoing and certain otherobjects in view, which` will appear later in the i345 specification, my invention comprises the devices described `and claimed and the equivalentsthereof. Y i y v y Inthe drawings Fig. 1 is apart sectional elevation through a crank pin turningjlathe embodying my improvement,

Fig. 2 is a part sectional fragmentary plan view' on line 22 of Fig. 1, showing the transmission gears.

As is clearly shown in the drawings, the tool-carrying frame 1 with its tool-holder`s 2 and 2a, is mounted on a pair ot parallel master shafts 3, 4 and, as in the patent above re# ferred to, is provided with eccentric means whereby the master shafts impart to the toolcarrying frame 1 a parallel-rod movement in phase with the crank pin of crank shait.

In applying my improved tool feed to a machine ot this kind I provide each tool-holder 2 on the orbital trame with a threaded nut 6 and a feed screw 7. 1When two oppositely placed tool-holders 2, 2a" are to be used, as shown in the drawings, the respective feed screws 7, 7 a are carried in bores andare connected by a pair oi. gears 8, 9 so that rotation of one gear, as 9, will produce thc desired feeding ofthetwo tools in tool-holders 2 and2a1.`

`Every part of the toolecarrying trame 1 describes a `circle of revolution during thepinturning operation and all of the tool-carrying i frames of the machine are to be connected to and simultaneously operated from a single source of power, such as the oil motor shown in Fig. 1. Means is provided for translating the rotation of the motor spindle into simul a taneous feeding movement of all of the cutting tools on all of the tool-carrying frames,

regardless of the orbital movement of the Jfra-mes.

A drive shaft 10, preferably a splined 4gear 12 is mounted on a bracket 13 with the gear 11 so that both gears 11 and 12 can move up and downlengthwisc the drive shaft 1U while they are being rotated by that shaft.

`The intermeshmg gears` are preferably miter gears, but they may be beveled gears, spiral gears, friction gears, or any other design that is found to answerthe purpose, without departing `from the spirit of my invention as set Yforth in certain of the claims. i.:

Y tool-carrying fralne 1 by means of the flange and slot connection 14 shown in Fig. 1, and although the gears are traversed up and down the drive shaft with the tool-carrying frame during its movement in a vertical direction they are restrained from-partaking of the movement of the frame in its horizontal direction.; .to v ,v To accommodate their horizontal movement the second gear 12 has its shaft 12a proj ecting into the tool-carrying frame 1 and operatively connected, by a sli-ding joint 15 or a telescopic shaft, to the feed screw gear 9. n

rIhus rotation of the second gear 12 is translated into a positive feeding movement of the cutting tools, regardless of the movement of thetool-carrying frame in a horizontal direction during its orbital movement.

` I will now describe the means by which' a number of tool-carrying frames, say, eight in a machine adapte-d for an eightthrow crank, are simultaneously fed from a single source of power such as theoil motor shown in Fig. 1. A Vpinion 16 is mount-ed on the motor shaft and meshes with a large 'gear 17 carrying-adrivo pinion 18 on an elongated hub 18a and this drive pinion v18 meshes with one or two splined drive-'shaft pinions 19. When the drive pinion 18 is vconnected as shown in Fig. 2 it operates the feeds .on two of the tool-carrying frames.' The rest of the series of feeds are operated by idler pinions 20 geared to the successive drive shafts 10, asshown. y

In operation the tools are set up to work in the usual manner by means of the adjusting nuts 6 and the feed screws 7 and 7a. The work being in place on the lathe centers in the usual Way, the machine is started and veach tool-carrying framel 1 commences its typical parallel rod or orbital` movement. The horizontal component of its travel is taken care of bythe lengthening'and shortening of the telescopic shaft 15; yThe vertical component of travel of frame 1 causes the two gears 11 and 12 and their bracket 151V to slide up-and-down 'along the revolving 'drive shaft 10. The motor rotates all of thedrive shafts 10 simultaneously and consequently identical feed is imparted to the tools operating on each of the several crankv pins. When the desired finished size is attained the feed is stopped by stopping or reversing the `feedmotor, or throwing it out of gear.

In practice I prefer to employ an oil motor that operates independently of the main lathefdrive mechanism because of its positive action and ease of speed control, but obvious- Y ly, the feed device'may if desired be driven Vfrom any suitably revolving part ofthe lathe,

as for AeXample,the main lathe spindles.

Having thus described my invention, what I claim and desire to'secure by Letters Patent is: f v

tool holder, a drive shaft rotatable on fixed bearings in the planeV of oscillation of the frame and geared to a source of power, a pair of intermeshing gears one of which is rotatable with the drive shaft `and slidable lengthwise thereon, the other gear secured to the other member of said telescopic shaft and a bracket carryingsaid gears and operatively connected to said frame.

2. In combination an oscillatable tool-carrying frame, a tool holder thereon, a` telescopic shaft, one member thereof carried by said frame and operativelyl connected to said tool holder, a rotatable drive shaft mounted on fixed bearings and located in the plane of oscillation of the frame and geared to a source of. power, a pair of intermeshing gears one of which is mounted on the drive shaft, rotat-able therewith and slidable lengthwise thereon, the other geark situated infixed relation with said first-mentionedV gear and movable 'therewith' and secured to the other member of said telescopic shaft and a bracket carrying said gea-rs,said bracket operatively connected to said frame by a sliding joint which is arranged to permit unrestrained .movement of the frame toward and away'from the drive shaft and* to constrain the bracket and gears to travel with the frameA in direc- 4tions lengthwise the shaft. f, v v3. In combination with the oscillatory toolcarrying frame of a crank pin .turning lathe of the'class describedya tool-feedingde'vice comprisingv a pair of co-operating'rotating elements arranged with their axes intevrsecting in the plane of oscillationfof said frame,

means associated with the frame fory traversingsaid'elements with the frame during its reciprocatory movement in one direction While restraining said elements fromppar- Vtaking of the reciprocatory movement ofthe frame in another direction, means for rotating said elements during the oscillatory movement of theframe and a shaft secured to one of said elements and rotatable therewith, and

, 4. In'oombinati'onkwith the oscillatory tool'- n carrying frame of a'crankpin turning lathe of the class described, la, tool-feedingfvdevice comprising a pair of co-operating--rotating elements, means Yassociated VVwith the ,frame lfor bodily moving said elements with-,the frame during its oscillatory movement in one direction While restraining said elements from parta-king of the oscillatory movement of the frame, in another direction, means for rotating said elements during the movement of the frame and means operatively connectingoneof said elements with said tool holder to impart feeding movement to the latter during its oscillatory movement.

5. In combination with the oscillatory toolcarrying frame of a crank pin turning lathe of the class described, a tool-feeding device comprising a pair of co-operating rotating elements arranged with their axes in lines intersecting in the lane of oscillation of said frame, means or traversing said elements with the frame during its reciprocatory movement in one direction While restraining said elements from parta-king of the reciprocatory movement of the frame in another direction, means for rotating said elements during the oscillatory movement of the frame and a shaft secured to one of said elements and rotatable therewith, and means operatively connecting said shaft and said tool holder and adapted to impart feeding movement to the latter during its oscillatory movement.

In testimony whereof, I aix my signature.

FREDERICK S. FLOETER. 

